changes to template variable syntax

I just checked into trunk (i.e. this is for PyBlosxom 2.0) code
re-write to Replacer.replace and VAR_REGEXP in the tools module.

I also checked in unit tests for what we had before as well as the new
functionality.

Previously we could handle variables like this:

   $foo
   $foo::bar
   $foo::bar()
   $foo::bar(1, 2, 3)
   $foo-bar
   $foo_bar
   ...

Now we handle all that as well as:

   $(foo)
   $(foo::bar)
   ...

The code is pretty fresh.  It passes the few unit tests I added, but I
didn't spend a lot of time working up a more comprehensive unit test
squite and I didn't spend time tuning the regular expression.

It's all in r1112:

http://pyblosxom.svn.sourceforge.net/viewvc/pyblosxom?view=rev&revision=1112

Anyone see any obvious issues with this?

/will

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